Caitlin asked whether detergent residues left on crockery and cutlery could be bad for our health. Katie Haylor spoke to Rob Chilcott from the University of Hertfordshire to find out. Like this podcast? Please help us by <a href="https://www.thenakedscientists.com/donate">supporting the Naked Scientists</a>

Could green humans harvest energy from the sun?

Each week we set out to solve one of the world's weirdest, wackiest, funniest and funkiest scientific puzzles. And along with the answer there's a brand new question to think about for next time...